1421.

Concave mirrors; philosophy of Aristotle; 737738
the books of Avicenna Italian and Latin vocabulary; Messer Ottaviano Palavicino or his Vitruvius 739
.
bohemian knives; Vitruvius 740
; go every Saturday to the
hot bath where you will see naked men;

Archimedes, on the centre of gravity 742
; anatomy 743
Alessandro Benedetto; The Dante of Niccolo della Croce; Inflate the lungs of a pig and observe whether they increase in width and in length, or in width
diminishing in length.

744
Marliano, on Calculation, to Bertuccio. Albertus, on heaven and earth 745
, [from the monk Bernardino]. Horace has written on the movements of the heavens.